173 
of Edinburgh, Session 1872 - 73 . 
boulders supposed to Lave come from Ben y Gloe, or some other 
ipountains to the north. 
Killin . — Ascended hill west of, made it 1350 feet above Loch 
Tay, and therefore about 1650 feet above sea. Sides of this 
hill, at least that facing eastward, covered with sandy detritus ; 
but could not discover whether stratified or not. This detritus 
here reaches to foot of some steep rocky crags, at height 
of about 1000 feet above loch. But on adjoining hills des- 
cried through telescope, sandy deposits at least 500 feet 
higher. 
At height of about 1090 feet above loch, rocks of hill 
exhibited effects of friction by action of some body pressing 
against them from a direction W. by S., viz., down the valley. 
Bocks facing east were uniformly rough. 
If it was a glacier which effected this smoothing, the drift 
deposits on hill sides must belong to a period subsequent in 
date, as glacier would have scoured them all away. 
On north side of Loch Tay, an extensive flat about 400 feet 
above loch, with appearance of a similar flat on opposite side. 
Schehallion ascended.— Bock composing it, a very hard sandstone. 
The hill forms a long ridge running E. and W., the highest 
part of which at west end, viz., about 3560 feet above sea. 
The side of hill which seemed smoothest, faces N.W. by W. ; 
but no striae, or even any very clear proofs of a grinding action, 
seen. Gravel, indicative of aqueous deposition, seen up to a 
height of about 3000 feet. 
Various small blocks of a fine grained grey granite scattered 
over surface up to a height of about 3000 feet. A similar 
rock said to be in situ at Loch Sunart to N.W. 
On south side of Schehallion, at a height of about 2500 feet, 
rocks apparently ground down and smoothed, but not above 
this level. 
In cliffs of the Burn courses on the south side of Schehallion, 
boulder clay noticed, up to a height of 1500 feet above the sea. 
All the strath between Dunkeld and Pitlochry seems to 
have been a lake. Bottom of this lake indicated by a flat, 
through which Bivers Garry and Tummel have cut, to present 
channels. This flat is about 50 feet above these river courses 
